The present invention provides a built-in remote terminal server, comprising a data acquisition apparatus for acquiring a remote field signal and a remote device control apparatus, as well as a plurality of Ethernet interfaces, an RS485 interface, a CAN bus interface, and a USB configuration interface, system configuration and project quantity configuration being performed by USB configuration software of a host computer or via Web remote access; and adopting a 32-bit ARM processor and a real-time embedded operating system. The built-in remote terminal server provided by the present invention is a smart multi-bus industrial measurement and control terminal, and is a basic compositional unit of a supervisory control and data acquisition (SCADA) system. The built-in remote terminal server is applied to production environments having distantly distributed measurement and control points and dispersed production units, and improves levels of industrialization and informatization to meet the need for a low-carbon economy, green development, and digital management.